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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <functional>
// template <class T>
// struct hash
// : public unary_function<T, size_t>
// {
// size_t operator()(T val) const;
// };
// Not very portable
#include <experimental/string_view>
#include <cassert>
#include <type_traits>
using std::experimental::string_view;
template <class T>
void
test()
{
typedef std::hash<T> H;
static_assert((std::is_base_of<std::unary_function<T, std::size_t>,
H>::value), "");
H h;
// std::string g1 = "1234567890";
// std::string g2 = "1234567891";
typedef typename T::value_type char_type;
char_type g1 [ 10 ];
char_type g2 [ 10 ];
for ( int i = 0; i < 10; ++i )
g1[i] = g2[9-i] = '0' + i;
T s1(g1, 10);
T s2(g2, 10);
assert(h(s1) != h(s2));
}
int main()
{
test<std::experimental::string_view>();
#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
test<std::experimental::u16string_view>();
test<std::experimental::u32string_view>();
#endif // _LIBCPP_HAS_NO_UNICODE_CHARS
test<std::experimental::wstring_view>();
}
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